Infiniti M45 Throttle Body Coolant Bypass

fxlr8

fxlr8

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Tools:
8mm Socket
10mm Socket
Flathead Screwdriver

Supplies:
5/16 Heater Hose (I used Fuel Injector Hose)
Coolant for topping off (I used De-Ionized water)

Warning:
Please do this at your own risk, I do not take any responsibility from the use of this writeup or mod.

1. Remove your engine covers.
1-10.jpg

2. Remove these 2 10mm bolts to remove your cool air intake tube.
2-7.jpg

3. Remove the intake tube from the throttle body and push aside.
3-5.jpg

4. Remove these 4 8mm bolts from the throttle body and remove the throttle body (don't forget to remove the wire connector.)
4-2.jpg

5. Remove this coolant line from the intake plenum and the other side.
5-2.jpg

6. Remove the coolant line under the intake plenum and other side. (This is an after photo since I forgot to take a picture.)
bottomtb.jpg

7. You will lose a small amount of coolant so be quick and install your new line on the underside and reuse one of the clamps.
5-1-1.jpg

8. Route the line under the TB area and connect it to the top connector (trim if needed) and reuse one of the oem clamps. I also zipped tied the line away from the sharp edges.
6.jpg

9. That's it, reinstall all the stuff we took off and you're done. (Don't forget to top off your coolant if needed.)
last.jpg
 
It basically just reroutes the coolant line from heating up the plenum/tb keeping the intake air cooler.
 
Yes it does, I've also done this mod on my old fx35 which uses the same vq35de as the M35.

You would just need to remove the intake and throttle body first.
Where the throttle body mounts to the plenum underneath you will see two hoses.
Disconnect the two hoses going into the plenum and connect them together using a metal barbed tubing connector.
 
Can't say that I really did notice much, maybe a slight increase in smoothness. Feeling the intake plenum before and after doing this mod I did notice it to be cooler after.
 
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